Starting and stopping mechanism for power-driven machines



M. HEMLEB.

STARTING AND STQPPING MECHANISIVIFOR POWER DRIVENI MACHINES APPLlcATl'o-N lFILED Denc.2, 1919.

Patented Mar. 14, 1922.

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M. HEMLEB. STABTlNG AND STOPPING MECHANISM FOR POWER DRIVEN MACHINES. APPLICATION FlLED DEC. 2191'9.

B11411181 Mar. 14, 1922.

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MARTIN. HEMLEE, OEELIZABETH, NEW JERSEY, RssIeNoR Tc THEsINGER MANUFAC- TURING COMPANY,y on ELIZABETH, NEW JERSEY, A CORPORATION o'E NEW JERSEY. f

STARTING AND srorPINe MECHANISMEOR PovvER-ERWEN MAcIiNE's.

v Speccafton'of Letters Patent.Vv

PatentedjvMarel-et; 1922;

' Application inea YInejeixnoeyf 2, lea., seriall No( 341,324. I

To all whom t may cancer/'rtg' Befitlniovvinthat I, MARTIN HEMLEBta citizen of the United' States; residingA at Elizabeth, in the countvot Unioni andState of New` Jerseyfhave invented Vcertainnew and luseful Improvements in Starting Stopping `B/Iechanisms f `tor .Power Driven Machines, of which thefollowingA isa specif cation, reference being .hadtherein .to the accompanying drawings; y

This' invention relatesto .starting and stopping 'or friction clutch and lake de# vices `jsuclrasare commonly usedfor con# trollin:3 small machines 1 l/Vith the devices' Vheretofore used, 'the braking efforthas been applied to the driven clutch element solely bynieansoi a movable brake... connected to the. clutch-controlling lever and it has been found that it suflicient braking effort is applied :to the "driven clutch element to stop the machineas quickly'as is noiv demandedfby users ot power-'operated machinesltliere is liabilityottlie mainshait being sprung, to say nothing oi' they Wear and tear on the bearings due tothe reaction.-

ary pressure of the main.shaft tliereagainst. Y

An object otthe present'inventio'n is'to provide a machine driving device which Will permit extremelvrapidt'positive and negativev acceleration ofthe main-shaft of thev machine to be 'driven Without subjectingvthe main-shatter its bearings to excessive pressures o rthrusts.v l' A further object of the'invention is to l prvide'a inachinedriving andr'lbraking device so contrived as toinsure that the driven 'elements relieved; 0f fill .'.dlef' the. .brilla when in running position.; Y i l n AH further object oflthefinventienfisf'to provide such a device in Ythe "formV *of air at`- tachment adapted Vfor `installa-tion npon an;T ordinary" machine having main-shatt which projects 'outwardly bevond the ma-v chine frame.,

Q-kffurther. object of the. invention is'to providea machine driving device ot sturdy and'extremelv simple .constructionl in which ,the defects of prior similar devices are overcome.V Further objects of the invention' will appear` fromglthe .following description and claims.

Forthepurposes of thepresent disclosure the inventionis embodied in the r form of a r thev operationof sewing or :other driving attachment for sewing machines and comprises driving 'and driven clutch.. elements carried by the outboard .projection'of themain-shat't of the machine. 'Oneol the characteristic fea-turesl of .the Ypresentk im'- provement is the use of a statienary brake element in opposition: to a movable brake element, `vsaid elementsV Vbeing .disposed s respectivelyy adjacent. the opposite side faces of thedijiven clutch'elementY or disk. The

pressure fof the movable brake element. is

thus .exerted ina .directi'onparallel with lthe mainshaft of the machine. The stationary brake elementVV affords a reactionaryfpressure, equal and opposite to thepressnre of the movable .brake element, thereby inl.

in thetorm of a bracket adapted forattach ment to AYthe standard of a sewing' machine and aording a] fulcrum`- support -for the movable; brake element or arm whichl is preferably rigidlvconnected to or 'formed as a p artfo'f a'manually controlledlutch; lever vtor, pressingthe clutchV elements .finto vtrictional `driving relationte oneanotlierl Another feature of the invention resides in ythefuse ofa .clutch-controlling lever hav- 'ing'a plurality lof arms one of which shifts the driven clutchv element away' from the Stationery-.brake @lement and. inte engage.- mentmvithV thek live clutchl element, and'. an-

other of Iwhich shifts the driven clutchl eleclanips it against the stationarvbrake; The

`live clutch elementis'preferably driveniby 'means g'o'if an electric motor to which it is directly connected byv meansV ot spira'l'gears as disclosed infmvcopending' vapplication Se-V fiar Nogasae. flied May eej 191s; thev referablythe.Stationarybrakeelement is v Y'mentaivay from theliveclutch element and present construction` being an improvement;

overV that disclosed .in' saidlapplication. -l Inthe.acceinpanying'drawings; Fig. 'l is VvaffsivdeY elevationot al .sewing machine' em# bodying.thevpresent'invention.. Fig. 2"'is aV rear end; elevation ofthe machine.. Figpis airagmentary .bottoni planview. Fig. iis

' a fragmentary' Ytop plan view of V'the station- 'ary and Ymovable brake. elementsishown in The machine A is formed with a frame comprising the bed 1, lstandard 2 and bracket-arm 3 Vterminating in the head 4 which supports the needle and presser-bars 5and 6, respectively, the former carrying the needle 7 which cooperates with a suitable loop-taker 8. The main-shaft 9 of the machine is journaled in the bracket-arm 3 and is operatively cgnnected to the various instrumentalities of the machine in any y usual or suitable manner.

' The main-shaft 9 includes the outboard projection 9 upon which the driving and driven clutch elements or disks 10 and 1-1 are mounted. The driving or live clutch element or'disk turns freely on the shaft 9, being confined against end play by means of the collar 12and ball thrust-bearing 13.

' The driven clutch disk 11 is splined to the main-shaft 9 so as to rotate with the latter while being free to slide endwise of said shaft toward and away'from thelive clutch element 10.` The spline or key llis'semicircular in side elevation and is received withina suitable recess in the shaft 9, as shown in Fig. 1. The clutch elements 10 and 11 are provided with coacting annual friction surfaces 14 and 15, respectively, which are made conical to augment the frictional driving effort of the live clutch element against the driven disk 11.

The live clutch element includes the spiral gear 16 which meshes with the spiral gear 17 on the transverse shaft 18-of the driving motor 19, the frame of which includes or is rigid with the split housing 20 for the gears 16 and 1,7. As described in my said copending application the split housing 20 is adapted to be clamped upon the rearwardly eX- tending bearing boss 21 of the machine frame by means of screws 22, Fig. 2.

vThe driven disk 11 is of larger diameter than the ldriving disk 10 and is formed with the parallel annular side surface portions 23 and 24 the diameter of which is greater than v that of thev conical surfaces 14 and 15, whereby the driven disk may be acted upon by the braking means to be described, without interference ofthe braking means with the live clutch element.

Fastened to a seat 25 at the rear of the standard 2 by a screw 26 is the base 27 of an upwardly and outwardly extending bracket 28 the free end of which carries a stationary g brake shoe 29 having a braking surface 30 disposed adjacent the face 24 of the driven disk 11 and at substantially right angles to the main-shaft 9. The bracket 28 thus forms a stationary brake which is rigidly mounted on the frame of the machine. An arm 19 rigid with the motor frame and housing 20 is secured at its free end to the bracket 28 by means of a screw 31 thereby assisting in supporting the motor 19. Y

Fulcrumed to the bracket 28 by means of `the scope of the invention as define din the the pin 32 is a three-armed controlk lever. One arm 33 of this lever carries an adjustable push-pin 34 made preferably of .roilsoaked wood and adaptedr tojbear against'the button 35 seated in the end of the hub 36 of force said disk away from the stationary Y brakingsurface 30 and into driving relation with the live clutch-element 10.

Another arm 37 of the three-armed clutch controlling levervconstitutes a vmovable brake element and is provided with-a brake shoe 38 having a braking surface 39, Fig. 4, disposed adjacent the face 23 of the driven disk and in parallelism with the stationary braking surface 30." The arm` r 37, which is disposed mainly atl the side'of the disk 11 opposite to that at which thearin 33 is located, operates when the clutch-controlling lever arm 33 is moved away-from the driven disk 11 to positively shift said disk away from the live Aclutch-element 10 and clamp it against the stationary brake `28. The third or operating arm 40 of thethreearmed clutch'controlling leveruextends downwardly from the fulcrum 32 and maybe operated in any suitable manner. 'In the V present instance the' arm 40 isconnectedby a link 41 to the arm 42 fixed to the shaft '43 which is journaled in the sleeve 44 formed as a part of the bracket 45 which is screwed on the under side of the bed 1. Another arm 46 is fixed to the rearward end of the shaft 43 and may be operated by means of'a treadle-rod 47. The control of the motor and treadle-rod may, if desired,y be effected in the manner disclosed in my said copending application. A coil spring 48 surrounding the sleeve 44 and anchoredv at its opposite ends to the arm 42 and collar 49 fixed to the sleeve 44, serves to force the movable brake i 38 toward the stationary brake 28. The stopscrew 50 limits the upward movement of the. arm 33 caused by a pull on the -treadle-rod.y While I have described a specific embodiment of the invention it will be obviousv to those skilled in the art that the essential features of the invention are susceptible'of various other specific embodiments Vwithin appended claims. Y, y Y Having thus set forth the nature of the invention, what Iclaim herein is`` 1. A machine driving device comprising, in combination, a shaft, a live clutch yele- 'ment loose on said shaft,fa driven clutchwheel connected to and slidable axially of said shaft into and out ofdriving relation with the live clutch element, a movable brake element disposed on the same side ofl away from the stationary brake element and 130 the driven L disk 11, Vthereby operating toV ioo `i325 the driven wheel asthe live clutch element,

.into engagement with the live clutch element and for operating the movable brake element to shift the driven wheel away from the live clutch element and against the stationary brake element.

2. A machine driving device having, in combination, driving and driven clutch disks, a stationary brake element having its operative surface disposed adj aoent one face of the driven clutch-disk, a control lever having clutch and brake arms disposed mainly at opposite sides of the drivenrdisk, the clutch-arm operating to press the driven disk away from the stationary brake and into engagement with the driving clutchdisk, and the brake-armY operating to shift the driven disk away from the driving disk and clamp it against the stationary' brake.

A machine driving attachment having, in combination, driving and'driven disks, a manually controlled lever for establishing and interrupting driving relationbetween them, a bracket on which said lever is pivoted, said bracket beingadapted for attachment to the machine frame and being provided with a stationary braking surface adjacent onel side face of thel driven disk, and braking means connected to said lever and opposed to said stationary braking surface for clamping the driven disk sidewise against the stationary braking surface.

4. A machine driving device having, in combination, driving and driven disks relatively movable axially to establish and interrupt driving relations between them, a stationary brake, rigidly mounted on the frame of the machine and disposed adjacent one side face of the driven disk, a treadle rod, a pivoted three-armed clutch and brakelever, one of said arms operating to press the driven disk into engagement with the driving disk, another of said arms having a brake surface adjacent the other side face end portion projecting outwardly beyond the frame of the machine, of a live clutch element freely rotatableron the free end of said shaft, a driven clutch disk mounted on and connected to said shaft adjacent the live clutch element and Inova-ble axially of said shaft toward and from the liveY clutch element, a stationary brake having its operative surface disposed adjacent one face of the driven disk, a manually controlled clutch lever having one arm forpressing the driven disk into Vengagement with the driving clutch element and a brake-arm for moving the driven disk away from said clutch element and into engagement with said stationary brake. Y f

6. A machine driving device having, in combination, driving and driven disks having annular friction driving surfaces, saidV driven disk Vbeing mounted for axial Inovement toward and4 away from the driving disk to establish and interrupt driving rela-y tions between them and also having annular parallel side-surface portions of greater di,-

ameter than said annularV friction driving surfaces, a stationary brake adjacent that one of said side surface portions farthest from lthe driving disk, a control lever for shifting the driven disktoward the drivino'.

disk, and a movable brake connected to said control lever and disposed adjacent the other of the annular side surface portions of the driven disk, said movable brake being adapted to shift the driven disk away from the driving disk and clamp the driven disk against the stationary brake.

In testimony whereof, I have signed my name to this specification.

MARTIN I-IEMLEB. 

